21223030 has 8 divisors (see below), whose sum is σ = 38201472. Its totient is φ = 8489208.

The previous prime is 21223009. The next prime is 21223051. The reversal of 21223030 is 3032212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21223009) and next prime (21223051).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21223030.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061142 + ... + 1061161.

It is an arithmetic number, because the mean of its divisors is an integer number (4775184).

Almost surely, 2^21223030 is an apocalyptic number.

21223030 is a deficient number, since it is larger than the sum of its proper divisors (16978442).

21223030 is a wasteful number, since it uses less digits than its factorization.

21223030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122310.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21223030 is about 4606.8459926505. The cubic root of 21223030 is about 276.8656831634.

Adding to 21223030 its reverse (3032212), we get a palindrome (24255242).

The spelling of 21223030 in words is "twenty-one million, two hundred twenty-three thousand, thirty".